Abstract：
BACKGROUND:Obstructive sleep apnea (OSA) has been increasingly linked to elevated blood pressure (BP) and hypertension. Repeated night-time hypoxia in OSA is associated with activation of two critical mechanisms of BP control: the autonomic nervous system and the renin-angiotensin system (RAS). The effects of OSA on the RAS are not well understood, especially in children. We hypothesized that children with OSA have elevated renin levels and abnormal relationships between BP and renin. METHODS:Polysomnography was conducted in 173 children to diagnose OSA (apnea-hypopnea index [AHI] >1 event/h) and control (AHI ≤1 event/h) groups. Age- and gender-specific z-scores for body mass index (BMI) were calculated to divide subjects into obese (BMI ≥95%), overweight (BMI ≥85% and <95%) and normal-weight (BMI <85%) groups. Morning BP was measured with an automatic sphygmomanometer and venous blood samples were collected for measurements of plasma renin, after overnight polysomnography. RESULTS:Plasma renin levels were not significantly different in all four groups after adjustment of age, gender, and race. Significantly negative associations between renin and BP were present only in the normal-weight control group and were absent in the other three groups. CONCLUSION:Plasma renin levels were not significantly increased in children with OSA compared to controls for both normal-weight and overweight subjects. The absence of normal, negative renin-BP relationships in both overweight and OSA children suggests a dysfunction of the RAS, which could be a mechanism for increased BP and the development of hypertension.
journal_name
Sleep Medjournal_title
Sleep medicineauthors
Shamsuzzaman A,Szczesniak RD,Fenchel MC,Amin RSdoi
10.1016/j.sleep.2014.05.022subject
Has Abstractpub_date
2015-01-01 00:00:00pages
101-6issue
1eissn
1389-9457issn
1878-5506pii
S1389-9457(14)00256-1journal_volume
16pub_type
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